21203322112 has 72 divisors (see below), whose sum is σ = 48461702912. Its totient is φ = 9069926400.

The previous prime is 21203322089. The next prime is 21203322121. The reversal of 21203322112 is 21122330212.

It is a self number, because there is not a number n which added to its sum of digits gives 21203322112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 958537 + ... + 980407.

Almost surely, 2^21203322112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203322112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24230851456).

21203322112 is an abundant number, since it is smaller than the sum of its proper divisors (27258380800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203322112 is an equidigital number, since it uses as much as digits as its factorization.

21203322112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22435 (or 22421 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21203322112 its reverse (21122330212), we get a palindrome (42325652324).

The spelling of 21203322112 in words is "twenty-one billion, two hundred three million, three hundred twenty-two thousand, one hundred twelve".